src/CutAndPaste.C

   1 /* \file CutAndPaste.C
   2  * This file is part of LyX, the document processor.
   3  * Licence details can be found in the file COPYING.
   4  *
   5  * \author Jurgen Vigna
   6  * \author Lars Gullik Bjønnes
   7  *
   8  * Full author contact details are available in file CREDITS
   9  */
  10
  11 #include <config.h>
  12
  13 #include "CutAndPaste.h"
  14 #include "BufferView.h"
  15 #include "buffer.h"
  16 #include "errorlist.h"
  17 #include "paragraph.h"
  18 #include "ParagraphParameters.h"
  19 #include "lyxtext.h"
  20 #include "lyxcursor.h"
  21 #include "iterators.h"
  22 #include "lyxtextclasslist.h"
  23 #include "undo_funcs.h"
  24 #include "gettext.h"
  25 #include "paragraph_funcs.h"
  26 #include "debug.h"
  27
  28 #include "insets/inseterror.h"
  29
  30 #include "support/LAssert.h"
  31 #include "support/lstrings.h"
  32 #include "support/limited_stack.h"
  33
  34 using std::endl;
  35 using std::pair;
  36 using std::make_pair;
  37 using std::for_each;
  38
  39 using lyx::pos_type;
  40 using lyx::textclass_type;
  41
  42 extern BufferView * current_view;
  43
  44 // Jürgen, note that this means that you cannot currently have a list
  45 // of selections cut/copied. So IMHO later we should have a
  46 // list/vector/deque that we could store
  47 // struct selection_item {
  48 //       ParagraphList copy_pars;
  49 //       LyXTextClassList::size_type textclass;
  50 // };
  51 // in and some method of choosing beween them (based on the first few chars
  52 // in the selection probably.) This would be a nice feature and quite
  53 // easy to implement. (Lgb)
  54 //
  55 // Sure but I just cleaned up this code for now with the same functionality
  56 // as before. I also want to add a XClipboard function so that we can copy
  57 // text from LyX to some other X-application in the form of ASCII or in the
  58 // form of LaTeX (or Docbook depending on the document-class!). Think how nice
  59 // it could be to select a math-inset do a "Copy to X-Clipboard as LaTeX" and
  60 // then do a middle mouse button click in the application you want and have
  61 // the whole formula there in LaTeX-Code. (Jug)
  62
  63 namespace {
  64
  65 limited_stack<pair<ParagraphList, textclass_type> > cuts(10);
  66
  67 } // namespace anon
  68
  69 PitPosPair CutAndPaste::cutSelection(ParagraphList & pars,
  70                                      ParagraphList::iterator startpit,
  71                                      ParagraphList::iterator endpit,
  72                                      int startpos, int endpos,
  73                                      textclass_type tc, bool doclear)
  74 {
  75         copySelection(startpit, endpit, startpos, endpos, tc);
  76         return eraseSelection(pars, startpit, endpit, startpos,
  77                               endpos, doclear);
  78 }
  79
  80
  81 PitPosPair CutAndPaste::eraseSelection(ParagraphList & pars,
  82                                        ParagraphList::iterator startpit,
  83                                        ParagraphList::iterator endpit,
  84                                        int startpos, int endpos, bool doclear)
  85 {
  86         if (startpit == pars.end() || (startpos > startpit->size()))
  87                 return PitPosPair(endpit, endpos);
  88
  89         if (endpit == pars.end() || startpit == endpit) {
  90                 endpos -= startpit->erase(startpos, endpos);
  91                 return PitPosPair(endpit, endpos);
  92         }
  93
  94         // clear end/begin fragments of the first/last par in selection
  95         bool all_erased = true;
  96
  97         startpit->erase(startpos, startpit->size());
  98         if (startpit->size() != startpos)
  99                 all_erased = false;
 100
 101         endpos -= endpit->erase(0, endpos);
 102         if (endpos != 0)
 103                 all_erased = false;
 104
 105         // Loop through the deleted pars if any, erasing as needed
 106
 107         ParagraphList::iterator pit = boost::next(startpit);
 108
 109         while (pit != endpit && pit != pars.end()) {
 110                 ParagraphList::iterator const next = boost::next(pit);
 111                 // "erase" the contents of the par
 112                 pit->erase(0, pit->size());
 113                 if (!pit->size()) {
 114                         // remove the par if it's now empty
 115                         pars.erase(pit);
 116                 } else
 117                         all_erased = false;
 118                 pit = next;
 119         }
 120
 121 #if 0 // FIXME: why for cut but not copy ?
 122         // the cut selection should begin with standard layout
 123         if (realcut) {
 124                 buf->params().clear();
 125                 buf->bibkey = 0;
 126                 buf->layout(textclasslist[buffer->params.textclass].defaultLayoutName());
 127         }
 128 #endif
 129
 130         if (boost::next(startpit) == pars.end())
 131                 return PitPosPair(endpit, endpos);
 132
 133         if (doclear) {
 134                 boost::next(startpit)->stripLeadingSpaces();
 135         }
 136
 137         // paste the paragraphs again, if possible
 138         if (all_erased &&
 139             (startpit->hasSameLayout(*boost::next(startpit)) ||
 140              boost::next(startpit)->empty())) {
 141 #warning current_view used here.
 142 // should we pass buffer or buffer->params around?
 143                 Buffer * buffer = current_view->buffer();
 144                 mergeParagraph(buffer->params, pars, startpit);
 145                 // this because endpar gets deleted here!
 146                 endpit = startpit;
 147                 endpos = startpos;
 148         }
 149
 150         return PitPosPair(endpit, endpos);
 151
 152 }
 153
 154
 155 namespace {
 156
 157 struct resetOwnerAndChanges {
 158         void operator()(Paragraph & p) {
 159                 p.cleanChanges();
 160                 p.setInsetOwner(0);
 161         }
 162 };
 163
 164 } // anon namespace
 165
 166 bool CutAndPaste::copySelection(ParagraphList::iterator startpit,
 167                                 ParagraphList::iterator endpit,
 168                                 int start, int end, textclass_type tc)
 169 {
 170         lyx::Assert(&*startpit);
 171         lyx::Assert(&*endpit);
 172         lyx::Assert(0 <= start && start <= startpit->size());
 173         lyx::Assert(0 <= end && end <= endpit->size());
 174         lyx::Assert(startpit != endpit || start <= end);
 175
 176         ParagraphList paragraphs;
 177
 178         // Clone the paragraphs within the selection.
 179         ParagraphList::iterator postend = boost::next(endpit);
 180
 181         paragraphs.assign(startpit, postend);
 182         for_each(paragraphs.begin(), paragraphs.end(), resetOwnerAndChanges());
 183
 184         // Cut out the end of the last paragraph.
 185         Paragraph & back = paragraphs.back();
 186         back.erase(end, back.size());
 187
 188         // Cut out the begin of the first paragraph
 189         Paragraph & front = paragraphs.front();
 190         front.erase(0, start);
 191
 192         cuts.push(make_pair(paragraphs, tc));
 193
 194         return true;
 195 }
 196
 197
 198 pair<PitPosPair, ParagraphList::iterator>
 199 CutAndPaste::pasteSelection(ParagraphList & pars,
 200                             ParagraphList::iterator pit, int pos,
 201                             textclass_type tc,
 202                             ErrorList & errorlist)
 203 {
 204         return pasteSelection(pars, pit, pos, tc, 0, errorlist);
 205 }
 206
 207 pair<PitPosPair, ParagraphList::iterator>
 208 CutAndPaste::pasteSelection(ParagraphList & pars,
 209                             ParagraphList::iterator pit, int pos,
 210                             textclass_type tc, size_t cut_index,
 211                             ErrorList & errorlist)
 212 {
 213         if (!checkPastePossible())
 214                 return make_pair(PitPosPair(pit, pos), pit);
 215
 216         lyx::Assert (pos <= pit->size());
 217
 218         // Make a copy of the CaP paragraphs.
 219         ParagraphList simple_cut_clone = cuts[cut_index].first;
 220         textclass_type const textclass = cuts[cut_index].second;
 221
 222         // Now remove all out of the pars which is NOT allowed in the
 223         // new environment and set also another font if that is required.
 224
 225         // Make sure there is no class difference.
 226         SwitchLayoutsBetweenClasses(textclass, tc, simple_cut_clone,
 227                                     errorlist);
 228
 229         ParagraphList::iterator tmpbuf = simple_cut_clone.begin();
 230         int depth_delta = pit->params().depth() - tmpbuf->params().depth();
 231
 232         Paragraph::depth_type max_depth = pit->getMaxDepthAfter();
 233
 234         for (; tmpbuf != simple_cut_clone.end(); ++tmpbuf) {
 235                 // If we have a negative jump so that the depth would
 236                 // go below 0 depth then we have to redo the delta to
 237                 // this new max depth level so that subsequent
 238                 // paragraphs are aligned correctly to this paragraph
 239                 // at level 0.
 240                 if ((int(tmpbuf->params().depth()) + depth_delta) < 0)
 241                         depth_delta = 0;
 242
 243                 // Set the right depth so that we are not too deep or shallow.
 244                 tmpbuf->params().depth(tmpbuf->params().depth() + depth_delta);
 245                 if (tmpbuf->params().depth() > max_depth)
 246                         tmpbuf->params().depth(max_depth);
 247
 248                 // Only set this from the 2nd on as the 2nd depends
 249                 // for maxDepth still on pit.
 250                 if (tmpbuf != simple_cut_clone.begin())
 251                         max_depth = tmpbuf->getMaxDepthAfter();
 252
 253                 // Set the inset owner of this paragraph.
 254                 tmpbuf->setInsetOwner(pit->inInset());
 255                 for (pos_type i = 0; i < tmpbuf->size(); ++i) {
 256                         if (tmpbuf->getChar(i) == Paragraph::META_INSET) {
 257                                 if (!pit->insetAllowed(tmpbuf->getInset(i)->lyxCode())) {
 258                                         tmpbuf->erase(i--);
 259                                 }
 260                         } else {
 261                                 LyXFont f1 = tmpbuf->getFont(current_view->buffer()->params, i, outerFont(pit, pars));
 262                                 LyXFont f2 = f1;
 263                                 if (!pit->checkInsertChar(f1)) {
 264                                         tmpbuf->erase(i--);
 265                                 } else if (f1 != f2) {
 266                                         tmpbuf->setFont(i, f1);
 267                                 }
 268                         }
 269                 }
 270         }
 271
 272         // Make the buf exactly the same layout than
 273         // the cursor paragraph.
 274         simple_cut_clone.begin()->makeSameLayout(*pit);
 275
 276         bool paste_the_end = false;
 277
 278         // Open the paragraph for inserting the buf
 279         // if necessary.
 280         if (pit->size() > pos || boost::next(pit) == pars.end()) {
 281                 breakParagraphConservative(current_view->buffer()->params,
 282                                            pars, pit, pos);
 283                 paste_the_end = true;
 284         }
 285
 286         // Set the end for redoing later.
 287         ParagraphList::iterator endpit = boost::next(boost::next(pit));
 288
 289         // Paste it!
 290
 291         ParagraphList::iterator past_pit = boost::next(pit);
 292         pars.splice(past_pit, simple_cut_clone);
 293         ParagraphList::iterator last_paste = boost::prior(past_pit);
 294
 295         // If we only inserted one paragraph.
 296         if (boost::next(pit) == last_paste)
 297                 last_paste = pit;
 298
 299         mergeParagraph(current_view->buffer()->params, pars, pit);
 300
 301         // Store the new cursor position.
 302         pit = last_paste;
 303         pos = last_paste->size();
 304
 305         // Maybe some pasting.
 306 #warning CHECK! Are we comparing last_paste to the wrong list here? (Lgb)
 307         if (boost::next(last_paste) != pars.end() &&
 308             paste_the_end) {
 309                 if (boost::next(last_paste)->hasSameLayout(*last_paste)) {
 310                         mergeParagraph(current_view->buffer()->params, pars,
 311                                        last_paste);
 312                 } else if (boost::next(last_paste)->empty()) {
 313                         boost::next(last_paste)->makeSameLayout(*last_paste);
 314                         mergeParagraph(current_view->buffer()->params, pars,
 315                                        last_paste);
 316                 } else if (last_paste->empty()) {
 317                         last_paste->makeSameLayout(*boost::next(last_paste));
 318                         mergeParagraph(current_view->buffer()->params, pars,
 319                                        last_paste);
 320                 } else
 321                         boost::next(last_paste)->stripLeadingSpaces();
 322         }
 323
 324         return make_pair(PitPosPair(pit, pos), endpit);
 325 }
 326
 327
 328 int CutAndPaste::nrOfParagraphs()
 329 {
 330         return cuts.empty() ? 0 : cuts[0].first.size();
 331 }
 332
 333
 334 int CutAndPaste::SwitchLayoutsBetweenClasses(textclass_type c1,
 335                                              textclass_type c2,
 336                                              ParagraphList & pars,
 337                                              ErrorList & errorlist)
 338 {
 339         lyx::Assert(!pars.empty());
 340
 341         int ret = 0;
 342         if (c1 == c2)
 343                 return ret;
 344
 345         LyXTextClass const & tclass1 = textclasslist[c1];
 346         LyXTextClass const & tclass2 = textclasslist[c2];
 347         ParIterator end = ParIterator(pars.end(), pars);
 348         for (ParIterator it = ParIterator(pars.begin(), pars); it != end; ++it) {
 349                 Paragraph * par = &*(*it);
 350                 string const name = par->layout()->name();
 351                 bool hasLayout = tclass2.hasLayout(name);
 352
 353                 if (hasLayout)
 354                         par->layout(tclass2[name]);
 355                 else
 356                         par->layout(tclass2.defaultLayout());
 357
 358                 if (!hasLayout && name != tclass1.defaultLayoutName()) {
 359                         ++ret;
 360                         string const s = bformat(
 361                                 _("Layout had to be changed from\n%1$s to %2$s\n"
 362                                 "because of class conversion from\n%3$s to %4$s"),
 363                          name, par->layout()->name(), tclass1.name(), tclass2.name());
 364                         // To warn the user that something had to be done.
 365                         errorlist.push_back(ErrorItem("Changed Layout", s,
 366                                                       par->id(), 0,
 367                                                       par->size()));
 368                 }
 369         }
 370         return ret;
 371 }
 372
 373
 374 bool CutAndPaste::checkPastePossible()
 375 {
 376         return !cuts.empty() && !cuts[0].first.empty();
 377 }